This week's UK TV & radio

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Listings for Channel 4 on Saturday, September 22 2018

05:55Triathlon: Ironman Wales Amidst the castles and stunning landscapes of Pembrokeshire, competitors face a 2.4 mile sea swim, a challenging 112 mile bike ride, and a 26.2 mile run to the finish. 
06:25Mobil 1 The Grid A look at heat management in a Formula 1 run using thermal cameras, Romain Dumas interviewed, and behind the scenes at the penultimate round the of the IMSA SportsCar Championship. 
06:50Everybody Loves Raymond Sleepover at Peggy's Ray is horrified when the mother of one of Ally's friends flirts with him as he drops his daughter off for a sleepover. 
07:15Everybody Loves Raymond Who's Next? Debra gets annoyed with Ray when he seems pleased that she's picked one of her attractive friends to replace her if she dies. 
07:40Everybody Loves Raymond The Shower Debra gives a bridal shower for Amy, but her good intentions get sidetracked by Marie's overzealous participation. 
08:05Everybody Loves Raymond Baggage Ray and Debra get involved in a two-week battle of wills over who is responsible for putting a suitcase away. 
08:35Frasier Hooping Cranes Frasier agrees to take his dad and Niles to the basketball, but can't believe his eyes when Niles is plucked out of the crowd and given the chance to win a big cash prize. 
09:05Frasier Docu Drama Frasier can't narrate Roz's ambitious space documentary, so she turns to legendary space hero and US Senator John Glenn. 
09:35The Big Bang Theory The Weekend Vortex Amy is upset when Sheldon breaks his promise to attend her aunt's birthday party in order to join the guys for a video game marathon. (S5 Ep19/24) 
10:05The Big Bang Theory The Transporter Malfunction Penny buys Leonard and Sheldon some Star Trek memorabilia but she is irked when they refuse to remove the toys from their packaging. (S5 Ep20/24) 
10:35The Big Bang Theory The Hawking Excitation When Stephen Hawking comes to lecture at the university, Howard is given the task of maintaining his wheelchair, making Sheldon envious. (S5 Ep21/24) 
11:00The Simpsons Tree House of Horror IV The Simpsons' Halloween Special IV sees Homer sell his soul to the devil for a doughnut, while a goblin is intent on sabotaging the school bus. 
11:30The Simpsons Marge on the Lam Marge and her new friend Ruth Powers set off on a Thelma and Louise-style adventure with Chief Wiggum and Homer in pursuit. 
12:00Come Dine with Me In Glasgow and Hamilton, Desmond's night of authentic Malaysian cuisine kicks off the competition. With a high standard set, it's a strong night to follow for Nikki, Vicky and James. 
13:00Four in a Bed The first visit of the week is to Stockton Mill B&B in Shropshire, where Stephen and Caroline Cox hope to provide a home from home. At breakfast, guest Kevin reveals his devious streak. 
13:30Four in a Bed The second visit is to Duxford Lodge in Cambridgeshire, run by ex-phone salesman Kevin Patel. Problems at breakfast time lead to some stiff criticism in the feedback. 
14:00Four in a Bed The third visit is to The Riverside House Hotel in Mildenhall. Ged and Suzanne take their guests on a team-building exercise, on which Stacey and Gemma's competitive streak is revealed. 
14:30Four in a Bed Last to host are Stacey Walsham and Gemma Dyche from The Gate Hangs High in Hook Norton, Oxfordshire, where they hope their dog-friendly accommodation will go down a treat. 
15:00Four in a Bed The B&B owners gather for the last time to find out what they've been paid and to settle some scores. What will Kevin have to say about his graffiti? 
15:30A Place in the Sun: Winter Sun Retired GP Steve is looking for the perfect family holiday home in the beautiful Valencia region of southern Spain. Danni Menzies scours the market and delivers five fantastic properties. 
16:35The People's Vet Ten-year-old Jack Russell Tabasco faces surgery; budgie George is losing his feathers; Snowy the cat has his tail removed after cancer, and Hurley the Labrador has puppy training. (Ep8) 
17:35Escape to the Chateau: DIY Dick and Donna's search for the armour in the lake continues. Tim and Krys struggle getting the attic converted in time. And Dick and his mother-in-law Jenny attempt to make salami. (Ep10) 
18:30Channel 4 News Includes sport and weather. 
19:00Britain at Low Tide Tori Herridge traces various attempts to make the River Clyde deeper to get ships into the heart of Glasgow, and examines the role of an odd-shaped vessel in a boat graveyard. (S2 Ep3/6) 
20:00Egypt's Great Pyramid: The New... ...Evidence Mystery has long surrounded the construction of Egypt's Great Pyramid, but now new discoveries are revealing its secrets. 
21:00Gods of Egypt Film (2016) Action fantasy. In Ancient Egypt, a mortal helps a god to battle the deity's evil uncle and save the kingdom. With Gerard Butler, Nikolaj Coster-Waldau and Geoffrey Rush. Violence. 
23:2513 Hours: The Secret Soldiers... Film ...of Benghazi: (2016) Fact-based drama set in 2012 Libya in the aftermath of Gaddafi's fall. US security staff attempt to defend a US diplomatic mission. Gory violence/strong language. 
02:00Experimental Unruly engineer Tim Shaw wants to uncover the scientific truth behind the incredible, funny and thrilling stunts on the web, so he and daredevil Buddy Munro set out to recreate them. (Ep1) 
02:55Hollyoaks Omnibus Misbah wants to prove to Auntie Kameela that their family isn't a shambles. Cindy has an unwelcome house guest, and James is disturbed to find out that Mac is back in the village. [SL] 
05:00Vet on the Hill A Border collie has knees that are completely shattered after spending his entire life locked in a cramped cage. A chihuahua has a heart murmur and needs surgery. (S1 Ep8/10) 
05:50Buy It Now Series with Brian Conley in which inventors have 90 seconds to pitch an item to an audience of shoppers. Simon from Loughborough has a nifty little solution to a very modern problem. (Ep1)